What is the main benefit of a low-e coating on windows?

The main benefit of a low-e (low emissivity) coating on windows is that it reduces the U-factor by minimizing radiant heat flow. A low-e coating reflects thermal radiation, which helps keep heat inside during winter and blocks it from entering in summer. This minimizes the amount of radiant heat that escapes or penetrates the glass, leading to improved energy efficiency in buildings. As a result, spaces remain more comfortable, and heating and cooling costs are reduced.

While enhancing aesthetic appearance, increasing sound insulation, and improving visibility through glass are potential advantages with different types of window coatings or treatments, they do not directly relate to the core function of low-e coatings, which is specifically geared toward energy efficiency through thermal management. Thus, the primary focus of low-e coatings is their role in reducing U-factor and improving a building's overall energy performance.